Entanglement generation and quantum information transfer between spatially-separated qubits in different cavities

Yang, Chui‐Ping; Su, Qi-Ping; Nori, Franco

doi:10.1088/1367-2630/15/11/115003

Cited by 38 publications

(32 citation statements)

References 68 publications

(65 reference statements)

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“…where from line 1 to lines 2 and 3 we have used the results given in Eqs. (15) and (16). Here, φ 0 = Ωπ/(2λ), η = λ 2 /(2λ) + 1/2, and η ′ = λ 4 /(2λ) − 1/2.…”

Section: Transfer Of Quantum Entangled States Of Two Cqubitsmentioning

confidence: 99%

Transferring entangled states of photonic cat-state qubits in circuit QED

et al. 2020

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We propose a method for transferring quantum entangled states of two photonic cat-state qubits (cqubits) from two microwave cavities to the other two microwave cavities. This proposal is realized by using four microwave cavities coupled to a superconducting flux qutrit. Because of using four cavities with different frequencies, the inter-cavity crosstalk is significantly reduced. Since only one coupler qutrit is used, the circuit resources is minimized. The entanglement transfer is completed with a single-step operation only, thus this proposal is quite simple. The third energy level of the coupler qutrit is not populated during the state transfer, therefore decoherence from the higher energy level is greatly suppressed. Our numerical simulations show that high-fidelity transfer of two-cqubit entangled states from two transmission line resonators to the other two transmission line resonators is feasible with current circuit QED technology. This proposal is universal and can be applied to accomplish the same task in a wide range of physical systems, such as four microwave or optical cavities, which are coupled to a natural or artificial three-level atom.

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“…where from line 1 to lines 2 and 3 we have used the results given in Eqs. (15) and (16). Here, φ 0 = Ωπ/(2λ), η = λ 2 /(2λ) + 1/2, and η ′ = λ 4 /(2λ) − 1/2.…”

Section: Transfer Of Quantum Entangled States Of Two Cqubitsmentioning

confidence: 99%

Transferring entangled states of photonic cat-state qubits in circuit QED

et al. 2020

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“…), which are placed in a single cavity or coupled to a single resonator [23][24][25][26][27][28][29][30][31]. Moreover, proposals have been presented to entangle qubits distributed in different cavities [32][33][34][35][36][37][38][39][40][41][42]. Note that the previous methods presented for entangling qubits in a single cavity or resonator may not be applied to entangle qubits that are distributed in different cavities, and the previous proposals for entangling qubits in different cavities are not universal, which depend on the specific cavity-system architecture and the way in which the cavities are connected.…”

Section: Introductionmentioning

confidence: 99%

Generation of quantum entangled states of multiple groups of qubits distributed in multiple cavities

Liu

Fang

et al. 2020

Phys. Rev. A

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Provided that cavities are initially in a Greenberger-Horne-Zeilinger (GHZ) entangled state, we show that GHZ states of N -group qubits distributed in N cavities can be created via a 3-step operation. The GHZ states of the N -group qubits are generated by using N -group qutrits placed in the N cavities. Here, "qutrit" refers to a three-level quantum system with the two lowest levels representing a qubit while the third level acting as an intermediate state necessary for the GHZ state creation. This proposal does not depend on the architecture of the cavity-based quantum network and the way for coupling the cavities. The operation time is independent of the number of qubits. The GHZ states are prepared deterministically because no measurement on the states of qutrits or cavities is needed. In addition, the third energy level of the qutrits during the entire operation is virtually excited and thus decoherence from higher energy levels is greatly suppressed. This proposal is quite general and can in principle be applied to create GHZ states of many qubits using different types of physical qutrits (e.g., atoms, quantum dots, NV centers, various superconducting qutrits, etc.) distributed in multiple cavities. As a specific example, we further discuss the experimental feasibility of preparing a GHZ state of four-group transmon qubits (each group consisting of three qubits) distributed in four one-dimensional transmission line resonators arranged in an array.

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“…(ii) Quantum state engineering and quantum operations with qubits distributed in different cavities. By using a SC qubit to couple two or more cavities/resonators, proposals have been presented for generating GHZ states with multiple SC qubits coupled to multiple resonators via employing cavity photons and through stepby-step control [40,44], and for quantum information transfer between two spatially separated SC qubits distributed in two cavities [45]. Recently, GHZ states of three SC qubits in circuits consisting of two resonators have been experimentally prepared [7].…”

Section: Introductionmentioning

confidence: 99%

Entangling superconducting qubits in a multi-cavity system

Yang

Zheng

et al. 2016

New J. Phys.

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Important tasks in cavity quantum electrodynamics include the generation and control of quantum states of spatially separated particles distributed in different cavities. An interesting question in this context is how to prepare entanglement among particles located in different cavities, which are important for large-scale quantum information processing. We here consider a multi-cavity system where cavities are coupled to a superconducting (SC) qubit and each cavity hosts many SC qubits. We show that all intra-cavity SC qubits plus the coupler SC qubit can be prepared in an entangled Greenberger-Horne-Zeilinger (GHZ) state, by using a single operation and without the need of measurements. The GHZ state is created without exciting the cavity modes; thus greatly suppressing the decoherence caused by the cavity-photon decay and the effect of unwanted inter-cavity crosstalk on the operation. We also introduce two simple methods for entangling the intra-cavity SC qubits in a GHZ state. As an example, our numerical simulations show that it is feasible, with current circuit-QED technology, to prepare high-fidelity GHZ states, for up to nine SC qubits by using SC qubits distributed in two cavities. This proposal can in principle be used to implement a GHZ state for an arbitrary number of SC qubits distributed in multiple cavities. The proposal is quite general and can be applied to a wide range of physical systems, with the intra-cavity qubits being either atoms, NV centers, quantum dots, or various SC qubits.

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Entanglement generation and quantum information transfer between spatially-separated qubits in different cavities

Cited by 38 publications

References 68 publications

Transferring entangled states of photonic cat-state qubits in circuit QED

Transferring entangled states of photonic cat-state qubits in circuit QED

Generation of quantum entangled states of multiple groups of qubits distributed in multiple cavities

Entangling superconducting qubits in a multi-cavity system

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